Yttrium,cobalt and yttrium/cobalt oxide coatings on ferritic stainless steels for SOFC interconnects |
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| Affiliation: | 1. Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alta., Canada T2N 1N4;2. School of Materials Science and Engineering, State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China;3. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alta., Canada T6G 2G6;1. Center for Fuel Cell Innovation, State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074, China;1. Nigde University, 51100 Nigde, Turkey;2. Meliksah University, 38280 Kayseri, Turkey;3. Miami University, Coral Gables, FL 33124, USA;1. New and Renewable Energy Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea;2. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;1. Center for Fuel Cell Innovation, School of Materials Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China;2. Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074, China;3. School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China |
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| Abstract: | Ferritic stainless steels are being considered as potential interconnect materials for SOFCs, in part because of their low cost relative to alternatives. These materials are, however, susceptible to degradation over time. A primary source of degradation is an increase in the area specific resistance (ASR), which is due to the formation of poorly conducting oxides (Mn–Cr spinel and Cr2O3) on the surface. In this work, the influence of Y, Co and Y/Co oxide coatings on the oxidation behaviour of a ferritic stainless steel (16–18 wt% Cr) has been investigated. Samples were oxidized in air for up to 500 h at temperatures ranging from 700 to 800 °C. Coated and uncoated samples were characterized, before and after heat treatment, using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric (TG) analysis and four-point probe resistance measurements.Surface morphology investigations of coated and uncoated stainless steels showed differences for Y and Co in terms of oxide formation. In all cases, Cr–Mn spinel and Cr2O3 were the two main surface oxides; however, the morphology of the spinel phase was dependent on the type of coating. The lowest resistances were obtained for the Y/Co-coated samples, which had ASR values up to seven times lower than corresponding uncoated ferritic stainless steels. |
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